When did the first photon emerge in the timeline of the Universe ?

And how did all photons automatically get modulated to a velocity of 3 x 10⁸ m/s ?

And how did all photons automatically get modulated to a velocity of 3 x 10⁸ m/s ?

 

It's 299792458 m/s.

In the natural units, it's normalized to 1. And the all massive particles velocities are fractions of it.

https://en.wikipedia.org/wiki/Natural_units

Edited October 30, 201510 yr by Sensei

Photons came with the big bang.

When did the first photon emerge in the timeline of the Universe ?

And how did all photons automatically get modulated to a velocity of 3 x 10⁸ m/s ?

 

Which photons are you referring to? First photons that we're capable of detecting? It's about 380000 years after the Big Bang, nowadays known as Cosmic Microwave Background Radiation.

 

I believe that photons, from the moment of their creation always move at c, they can't exist any other way.

 

 

 

It's 299792458 m/s.

 

Wow! And some people say that I like to nit-pick...